AES encryption error in java -

i try decrypt encrypted text , use code error me:

exception in thread "main" java.security.invalidkeyexception: illegal key size 

and decryption code is:

string key = "ffce885876a617e7";     string vector = "9ee153a3df56965e7baf13a7fa1075cc";       ivparameterspec ivspec = new ivparameterspec(key.getbytes());     secretkeyspec keyspec = new secretkeyspec(vector.getbytes(), "aes");       cipher cipher = cipher.getinstance("aes/cbc/nopadding");     cipher.init(cipher.decrypt_mode, keyspec, ivspec); //error occured in line 

.getbytes() not automagically convert "hex string" matching bytes.

instead, try utility method:

private static byte[] hexstringtobytes(final string input) {     final int len = input.length();     if (len % 2 != 0)         throw new illegalargumentexception();      final byte[] ret = new byte[len / 2];     int offset = 0;      (int = 0; < ret.length; i++) {         ret[i] = (byte) integer.parseint(input.substring(offset, offset+2), 16);         offset += 2;     }      return ret; } 

then in code use hexstringtobytes(key) etc.